Malicious PDF — malware analysis report

Static analysis result for SHA-256 38d36626878fa21c…

MALICIOUS

PDF

49.2 KB Created: 2021-06-07 06:52:20 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7)
MD5: 5a35b579c411fbaef6a0b54dceca3084 SHA-1: 72d964432817972c3abc644cc2c8af3a71e777f8 SHA-256: 38d36626878fa21c46ce9955d4558e9ec4f690bf68e7ddf2b6f898ffed8d362d
82 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The document presents a fake CAPTCHA or human verification prompt to trick the user into interacting with it, likely leading to a download. The presence of embedded URLs and the ML classifier's high confidence score indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URLs suggest it's designed to exploit user interaction for payload delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9796

Heuristics 4

  • Fake CAPTCHA / human verification prompt high SE_FAKE_CAPTCHA
    Document displays a fake CAPTCHA or human-verification prompt — used to trick users into running commands or pressing keyboard shortcuts
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • External URI info PDF_URI
    PDF contains an external URL action
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://netcdn.tw/app/431946152/hack-velocidad-del-juego-x3-roblox-game-hack
    • http://www.en.guofuhee.com/Public/upload/editorfiles/free-robux-gift-card_GM431946152.pdf
    • http://www.en.guofuhee.com/Public/upload/editorfiles/free-roblox-wings_GM431946152.pdf
    • http://www.en.guofuhee.com/Public/upload/editorfiles/coin-master-gift-link_GM406889139.pdf
    • http://www.en.guofuhee.com/Public/upload/editorfiles/free-robux-codes-no-human-verification_GM431946152.pdf
    • http://www.en.guofuhee.com/Public/upload/editorfiles/roblox-com-free-robux_GM431946152.pdf
    • http://www.en.guofuhee.com/Public/upload/editorfiles/www-rbx-com_GM431946152.pdf
    • http://www.en.guofuhee.com/Public/upload/editorfiles/coin-master-free-spins-for-today_GM406889139.pdf
    • http://www.en.guofuhee.com/Public/upload/editorfiles/free-robux-games-that-actually-work-2021_GM431946152.pdf
    • http://www.en.guofuhee.com/Public/upload/editorfiles/coin-master-hack-spin-ios_GM406889139.pdf
    • http://www.en.guofuhee.com/Public/upload/editorfiles/robux-hacks-2021_GM431946152.pdf
    • http://www.en.guofuhee.com/Public/upload/editorfiles/how-do-i-get-free-spins-in-coin-master_GM406889139.pdf
    • http://www.en.guofuhee.com/Public/upload/editorfiles/robux-get-com_GM431946152.pdf
    • http://www.en.guofuhee.com/Public/upload/editorfiles/free-coins-and-spins-for-coin-master-game_GM406889139.pdf
    • http://www.en.guofuhee.com/Public/upload/editorfiles/robux-matchcomfree-robux_GM431946152.pdf
    • http://www.en.guofuhee.com/Public/upload/editorfiles/100-free-coin-master-spins_GM406889139.pdf
    • http://www.en.guofuhee.com/Public/upload/editorfiles/free-robux-2021-no-human-verification_GM431946152.pdf
    • http://www.en.guofuhee.com/Public/upload/editorfiles/free-robux-android_GM431946152.pdf
    • http://www.en.guofuhee.com/Public/upload/editorfiles/robux-win_GM431946152.pdf
    • http://www.en.guofuhee.com/Public/upload/editorfiles/coin-master-free-daily-spins-link_GM406889139.pdf
    • http://www.en.guofuhee.com/Public/upload/editorfiles/free-coin-spin-daily-link-for-coin-master-game_GM406889139.pdf
    • http://en.wikipedia.org/wiki/MIT_License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off00005026.bin
7f4d2d3f4fd521e2926c2dc48714f5db67edfc7368c14bb2074e2ae31c2e296b		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0x5026 26020 bytes
font_01_sfnt_off00008cb1.bin
450e3ee45915afe13702bf1d587eb8b9ad88a8d2113419ac9f2fd116a828e139		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8CB1 5696 bytes
font_02_sfnt_off000099c3.bin
02e1deba2bbe34782c591cfb22d01b1dffbe04fd22c29d303b626edc4f1e87c2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x99C3 19548 bytes

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